Check the earth clamp, make sure all the cables or in good condition and secured, if the unit is three phase, get an electrition the ensure all the phased are functioning. test the fuses with a meter, get back to me if all is OK

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just take the lead for the wire and attach it to the ground terminal and attach the ground wire to the + terminal
there will be diagrams in your user manual and if you don't have a manual then go google and type in--- user manual for mig welder 195 model( model not included in your question)--- and there will be a psd version to down load

There are two wires comming from the circuit board to the wire feed motor. You can try running the motor directly from a 12v battery or two for 24 volts. You might want to look at the name plate on the motor to check the normal DC current it draws. If you do not have an ammeter, you could use a fuse close to or just under the normal current. If it runs and draws too much current, then you know you have motor problems.If it runs well and draws a fraction of normal current,you know the motor is good. Before you condem the circuit board, check that it is receiving the correct input voltage. If the welder is dual voltage,then somebodys mistake making voltage change could send 240 v to the board that is meant to receive 120v. Hope this helps, Robert

If it has a setting for constant volatge, that is for wire feeders, flux cored or mig. Constant current is for stick welding. Some wire feeders have a switch to use them with a constant current machine, but that doesnt work very well, and , in my opinion, is hard on the computer in the feeder.

It looks like the ones we use in the field with a ln-25 wire feeder and flux cored wire. for mig you will also need a bottle of sheilding gas.

Maybe you can get lucky like I did . Some times the acr volt selector switch gets corrosion in it and wont let the circuit board know to send power to the wire feed motor. You can cycle this arc volt. switch in my case it is the a,b,c,d,e, switch back and fourth a few times and this will brake the corrosion and your wire might feed again as mine did . This corrosion build up happens from not using and or sollecting the switch much usually on a welder at hm that gets very little use. it is common good luck .

It sounds like the feed spool is too loose or worn out.There should be a tension adjustment. What wire size are you using? On those off brands they usually use .035. and make sure the spool is not dragging. The wire spool also has a tensioner, or should have, in the center. Good luck.